Investigators are trying
to determine whether Katherine's DNA or fingerprints are on any
of the bomb fragments.But two sources told The New York Times that
DNA and fingerprints found on what's left of the bombs
do not match Katherine.

Earlier this week, the FBI removed several bags from
Katherine's parents' home,
a spokesman confirmed to USA Today.

A friend of Katherine's told the Daily Mail that
Tamerlan
"brainwashed" her. She converted to Islam after
she met him. People magazine interviewed
a family member who said Katherine became "very withdrawn"
and stopped seeing her friends after marrying Tamerlan.

Authorities have previously said the brothers acted alone in the
April 15 bombing, but they're still trying to figure out who knew
what and when. The attack killed three people and injured more
than 200. The investigation is ongoing.

Three additional suspects — who were friends of Dzhokhar —
were arrested this week in connection with the bombings.
There is no evidence they helped plan the attack, but they might
have taken items out of Dzhokhar's room after he was identified
as a suspect.

Business
Insider reached out to Katherine's lawyer for comment on
Friday but did not immediately get a response.